US1745038A - Telephone system - Google Patents

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Publication number
US1745038A
US1745038A US222741A US22274127A US1745038A US 1745038 A US1745038 A US 1745038A US 222741 A US222741 A US 222741A US 22274127 A US22274127 A US 22274127A US 1745038 A US1745038 A US 1745038A
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relay
armature
lead
circuit
earth
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Arthur J Ray
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Associated Telephone and Telegraph Co
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Associated Telephone and Telegraph Co
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing

Definitions

  • The. present invention relates to telephone systems and is more particularly concerned with what is known as routine testing appara tus, that is to say apparatus arranged to re produce automatically the actual conditions of use for each unit in turn of a large group of similar pieces of apparatus.
  • the invention a'lsois intendedto be applied more particularly to the testing of apparatus which can 10 only be tested while it is not actually in use and must not be busied to its normal means of access in order that a test may take place. It is generally recognized nowadays that routinetesting is'desirable, it" not essential,
  • an automatic testingarrangement having a 0 piece of apparatus is adapted to be prevented I hunting switch for associating with the test.
  • a further feature of the invention is the 5 provision of an automatic testing arrangement for the routine testing oftelephone apparatus when Such apparatus isnotin use in which means associated with the testlng equipment enable part cular pieces of appara in use So that certain tests may be carried out in conjunctionwith the user ofthe apparatus,
  • the testing of the complete apparatus falls naturally into two parts, one comprisingthe testing of the actual impulse senders which may be done as described'in British Patent No. 267,606 and the other the testing of the junction relay sets and apparatus for associating impulse senders with the operators keyset. A-little consideration will Show that for a complete test to be carried out it is necessary v to employ the apparatus at the operators position used for associating an idle impulse sender with that posltiomhence it follows that the test cannot be carried out while the position is in service.
  • FIG. 1-8 Show the various con trolling keys and a number of the associated relays
  • Figs. 3 and t show a further group of the relays controlling the ro'utiner
  • Figs. 5 and 6 show the test switch TS, the ro'utine'in- I dicating switch R18 and the number-set-up switch NS, together with the fault indicating lamps for indicating the progress of aparticular test
  • Figs] and 8 Show the distribution equipmentvbymeans of which connect-ion is made with each position in turn, and also with each 1unct1on in turn at a'par ticular position.
  • the position distribution equipment comprises a primary distributor PD from which access is had to three secondary distributors SD SD of which only SD and SD are shown since the circuits of SD are similar.
  • the contacts of the primary distributor PD are multipled round the bank as shown in Fig. 7, so as to avoid unnecessary operation of the switch. Since it is not found possible to provide the secondary distributors with sufficient wipers for all the functions which they are required to perform, each one has associated with it an auxiliary secondary distributor of which only the auxiliary secondary distributor ASD associated with the switch SD is shown in Fig. 8.
  • Each secondary distributor is wired to have access to 20 operators positions and when all .the 20 have been tested or found busy, the
  • junction distributors such as JD and JD .shown in Fig. 8, which are given access to a maximum of 24 and 22 junctions respectively. ⁇ Vhere the full 50 junctions are equipped, access is obtained to the last four over the first four contacts of the distributor JD a suitable switching operation being performed to connect these junctions up in place of junctions 14 as will be described subsequently.
  • the junction distributors are provided with a normal position in which the contacts are left dead and by this means the wipers of the junction distributors associated with all the positions may be inultipled together to the routine test set and the position distributors ensure that the juncton distributors of only one position shall be operated at a time.
  • the banks of wipers 618-620 of the secondary distributor SD are wired to the various junction distributors in the same manner as is indicated by the wiring of the first contacts in the banks of SD.
  • the bank of Wiper 617 is wired to the contacts of the associated position battery feed relays wh le that of wiper 621 is wired to the bank of the associated auxiliary secondary distributor completed for changing over from junctions 1-4 to junctions 4;" 50 where this is necessary.
  • the other auxiliary secondary distributors are wired in a similar manner.
  • the bank of wiper 625 of the unction distributor J D is wired to the lamp leads of the various junctions, that of wi er 626 to the respective assignment leads an those of wipers 627 and 628 to the negative and positive trunk conductors respectively.
  • relay 115 completes a circuit for relay 127 which extends as follows: battery, winding of magnet 507 of the switch TS, lead 439, armature 313 and its back contact, lead 726, lead 441, interrupter contacts 508, wiper 506 and its normal contact, lead 93, winding of relay 127, armature 122 and its front contact.
  • Relay 119 now operates and at armature 120 opens the circuit of relay 280 which is normally energized in the following circuit: battery, relay 280, lead 698, lead 407, normal contact and wiper 622 of the switch SD normal contact and wiper of the switch SD represented by the link 624, normal contact and wiper 616 of the switch SD lead 18, lead 664, armature 120 and its back contact to earth and at the front contact of armature 120 extends earth over lead 686, lead 26, wiper 603 of the primary distributor PD, lead 23, winding of relay 215 to battery so that relay 215 is operated and prepares circuits for the junction distributors and auxiliary secondary distributor and also for the relay 185. Furthermore at armature 121 relay 119 prepares a circuit for stepping the junction distributors.
  • relay 127 prepares circuits for relays 152' and 180 and at armature 130 closes the pulsing circuit of the secondary distributor.
  • Relay 119 moreover at armature 123 opens the homing circuit of the primary distributor and provides a locking earth, at armature 124 prepares a circuit for stepping the primary distributor after each secondary distributor has rotated over all positions connected to it, at
  • armature 126 opens an alarm circuit over lead 57 V and at armature 12 5 *co'nnects earth to motor start lead '94 and opensj'the normally closed circuitf r relay 27 8' which extends as follows: battery, winding of'relay 278, lead 714,"l'ead 493, lead 845,'link 649 representing wipers and norlnalicontacts of all the junc tion distributors not shown, normal contact and wiper 637, norinal contact and wiper 630, lead 1, lead 665,back contact and armature toearth.
  • Relay'278 now de-energizes thereby altering certain supervisory circuits as will be described subsequently.
  • pulsing circuit completed on the operation of relay 127 extends from earth, winding of relay 264, armature 267 and its back contact,
  • the battery feed relays ot' the other'operators positions are connected up similarly to other contacts in the banks oiithe' switches SD SD
  • the secondary distributor continues to advance step by-step owing to the pulses received from relays 264, 266 and 268 until wiper 611 encounters a contact to which earth is'connected owing to the operatorjbeing absent from the corresponding position.
  • Relay 131 is operated in this circuit and at armature 133'prepares a circuit for the magnet 631 of the unction distributor J D at armature 134 completes a c'ircuit'tor relay 152, at armature 135 closes another-:
  • the circuit for relay 185 may be traced from earth, wiper 604 and its first contact, wiper 615, multipling to wiper 646, lead 3, armature 219, and its front-contact, windr of relay 185-to-battery, andthe operation of the relay opens the stepping circuit at' armature 191.
  • relay 152 operates, at
  • armature 155i completes a locking circuit fo'rfitself which extends" as follows: battery, winding "ofrelay 152, armature 155 and its 1 front contact, normally closed right-hand springs'of the re-start key RS,ar1nature 169 and its baokcontact, front contact and arma- I ture 123 .to, earth, at armature 156 opens a. point inthe circuits of the relays 137, 143 and 162,'an'd at armature 157 prepares a circuit for'horning the unction distributors.
  • relay 180'eX- a circuit for relay 180'eX- tending as follows: battery,-winding of relay 180, front, contact and armature .190, lead 67 1,-front"contact and armature 135, armature 129 and its front-contact, front contact andarm'ature 134, armature-169 and its back contac't,:tront contact and armature 123 to earth.
  • relay 330 is operated and at armature 331 opens the circuit of the relay 314, at armature 332 completes a direct circuit for magnet 507 and at armature 333 completes a locking circuit for itself extending as follows: earth, armature 332 and its front contact, lead 441, inter rupter contacts 508, lead 429, armature 333 and its front contact, winding of relay 330 to battery.
  • the connection of earth to wiper 501 completes a circuit for the first supervisory lamp 542 over lead 753, which lights to indicate that a free position has been found.
  • Vhen magnet 507 has operated fully and opened interrupter contacts 508, relay 330 de-energizes thereby opening the circuit of magnet 507 so that the switch TS is advanced one step.
  • the earth connected to wiper 503 is now extended over lead 440, lead 35, back contact and armature 163, armature 121 and its front contact, front contact and armature 133, lead 667.
  • the succeeding pulse from interrupter 485 again operates relay 330 and this in turn effects the advance of the test switch.
  • the test switch takes its next step and advances to its third position, the circuit just traced is opened and accordingly the wipers of the junction distributor JD are advanced one step.
  • the position which has been connected with should only just have been vacated by the operator so that there is a call still in progress over the first junction, there will be earth on the lamp lead and this will accordingly be extended over the appropriate contact in the bank of wiper 625, lead 13, lead 74, lead 720, armature 340 and its back contact, lead 721, upper winding of relay 376 to battery.
  • the initial circuit over lead 440 is opened and relay 334 is operated over wiper 503 and lead 443. Accordingly the following circuit is now completed: earth.
  • the switch JD is arranged to deal with 24 junctions, and when its wipers are advanced into engagement with the last of these junctions, the following circuit is completed: earth, wiper 629 and the 24th contact in its bank, lead 12, winding of relay 172 to battery.
  • ⁇ Vhen relay 180 de-energizes, earth is supplied at lead 805, first contact in the'bank of-w1per armature 184 for homingthe test switch and when this reaches normal position, relay 127 is operated.
  • Relay 175 being slow to release holds up for a moment and when'it de-energizes the wipers of the switch JD are advanced a further step and the circuit of relay 166 is then opened and it a slowly releases.
  • relay 131 operates andcompletesa'circuitfor I relay 180 andthis'in'turnoperates relay 229 which locks up clependentupon relay 280fand 292: Hence if all the secondary distributors shouldpass over the whole of their banks without finding any'position in a condition to be tested, relays 131, 180 and 229 will not be operated and in this case when wiper 621 of the secondary distributor SD engages its 21st contact, earth is extended over lead 15, armature 231 and its back contact, lead 685, lead 65, upper winding of relay 285 to battery.
  • Relay 285 is a two-step relay and at this time only operates its light armature 290 thereby short-eircuiting its lower winding by earth on the left-hand contacts of the restart key RS. Then the secondary distributor SD receives a further pulse, the initial energizing earth is removed and relay 285 then operates fully over both its windings in series and is accordingly locked up to the re-start key BS. The operation of relay 285 at armature 291 completes a circuit for the routine finished lamp 284 and the lower winding of relay 314 in series and relay 314 operates with results to be described subsequently.
  • Relay 285 moreover at armature 286 opens the normal pulsing circuit for the secondary distributors and auxiliary secondary distributors, at armature 288 opens an auxiliary energizing circuit for itself, at armature 289 opens a point in the circuit of relay 131 and at armature 287 connects earth to wiper 616 of secondary distributor SD
  • This switch accordingly commences homing and when it has reached its normal position the homing earth is extended to the secondary distributor SD When this switch in turn has reached its normal position the homing earth is transferred to the switch SD and when this switch has returned to normal a circuit is again completed over lead 407 for relay 280.
  • Relay 280 upon operating, at armature 281 opens a further point in the locking circuit of relay 229 and at armature 282 opens a point in the magnet alarm circuit.
  • the earth over the back contact of armature 125 is extended over leads-665 and 1 to wiper 630 of the junction distributor J D and serves to efiect the homing motion of this switch.
  • the switch When the switch reaches its normal position, the homing earth is extended to the switch J D and this in turn is operated to normal.
  • All the other unction distributors accessible to the routiner are homed in a. similar manner, one after the other, and accordingly all the apparatus is left in the position shown ready for a further test to be initiated, for instance the next day.
  • the sole exception is the auxiliary secondary distributors for since they always follow their associated secondary distributors when they are required for use it is unnecessary to return them to a definite normal position. It may be mentioned also that with the arrangement shown, the operation of the key RS is necessary to bring down relay 285, but this could if desired be dependent on relay 115 so that it would release when the start key was restored.
  • ⁇ Vhen relay 376 deenergizes, a clrcuit is completed for relay 330 extending as follows: battery, winding of relay 330, lead 45, lead 683, armature 182 and its front contact,'lead 682, lead 33, wiper 502 and the third contact in its bank, lead 461.
  • relay 336 earth through the lower winding of relay 376 is connected over lead 7 24, front contact and armature 340, lead 720, lead 74, lead 13 and over wiper 625 of the switch J D to the lamp lead; if .this lead is continuous, battery through the lamp will be operative to energize relay 376.
  • earth is connected over lead 7 09 through the winding of relay 389 and over lead 405 and wiper 628 to the positive trunk conductor. In case this trunk should be in contact with any adjacent leads, a circuit will now be completed for re lay 389 and it will thereupon operate.
  • relay 376 fails to come up, earth on lead 437 will be extended over backcontact and armature 378, lead 708, lead 438,1ead 748, lamp 538, to battery.
  • relay 385 operates a circuit is com; pleted over frontcontact andfarmature 386 and leads 706, 436 and 749 for lamp 539 and if relay 389 operates lamp 540 is lighted over armature390, lead 705, lead 435 andlead 750.
  • a circuit is now completed from the interrupted generator 400 over lead 7 37,"frontcontact and armature 383, back contact and armature 387 armature 391 and its back contact, lead 7 38, lead 462, fourth contact in the bank of wiper 502 and said wiper, lead 33, lead 682,
  • relay 341 battery through re-' sistance 399 is connected at armature 342 over lead 709 through relay 389 to the positive trunk conductor anda'at armfature343 earth through the lower winding of relay, 385 is connected over lead 719 to the negative trunk conductor. .Relay 385 only operates if there is battery on the negative line, while the re sistance of relay389 and resistance 399 in series is sufliciently highto' prevent the opera;
  • relay 330 Asbefore eifects the stepping of thejtest switchover the nextthree positions. In each of these positions earth over wiper501 is extendedto the indicating lamp 543. i I
  • the test switch When the test switch reaches its 8th position the circuit of relay 341 is opened and earth is connected over wiper 501 andthe multipled 8th, 9th,'10th and 11th contacts in its bank to the junction assigned indicating lamp 544.
  • the stepping of the test switch over the 8th and 9th contacts is effected by earth from the interrupter 400 being extended over armature 329 and its back contact lead 454 to the contacts engaged by wiper 502 whence a circuit iscompleted forrelay 330 in the usual manner.
  • the test switch While the test switchisin its'ninth position, a circuit is completed from earthen wiper 503 to the ninth contact in its bank, lead 444, lead 745, lead'406 and wiper 626 to the assignment lead associated withthe junction.
  • relay 376 Uponeach operation of relay 376, earth is connected at "armature Accordingly the junction is assignedand the I I 377 to lead 434 over lead 704 whence'it is eX- tended tothe llthfcontactin the bank of wiper 502 and serves to operate relay 330 as before, -When the test switch reaches posit1on-12, indicating lamp 545 is lighted and a circuit is completed over wiper 503 and lead 448, for relay 344 which accordingly operates.
  • the test switch is advanced one step into the 13th position.
  • the circuit relay of 344 is broken and it de-energizes, thus disconnecting the wipers of the number-set-up switch and completing circuits to cause this to return to normal under the control of interrupter contacts 532.
  • the 13th position of the test switch indicating lamp 546 is lighted and a circuit is completed over wiper 503 and lead 456 for relay which upon operating, at armature 356 locks to earth provided at armature 184 of the relay 180.
  • armature 354 it connects battery through resistance 399 and relay 389 over lead 709 to the negative trunk conductor and at armature 355 connects earth through the lower winding of relay 385 over lead 719 to the positive trunk conductor.
  • the code digits set up on the storage relay groups in the impulse sender in response to the operation of the number-set-up switch are now sent out, suitably translated so as to cause the routing of the call over a special test level in a selector whence connection is established back to the routiner over the leads 481. 482 and 483.
  • relay 367 which extends as follows: battery, lower winding of relay 367, lead 7 29, normally closed springs controlled by armature 359, lead 482, negative trunk conductor, polarized relay in the junction relay set, positive trunk conductor, lead 483, armature 363 and its back contact, normally closed springs controlled by armature 358, lead 728, upper winding of relay 367 to earth.
  • Relay 367 is accordingly now operated but the polarized relay in the junction relay set does not operate at this time owing to the current flow being in the wrong direction.
  • relay 367 Upon the operation of relay 367, at armature 368 a circuit is prepared for relay 364 and at armature 369 a circuit is completed for relay 370 and this accordingly operates in turn and at armature 371 prepares a circuit for relay 309 oy er leads 702 and 703. After the junction has been assigned, a steady earth should be applied to the lamp lead and if this condition is duly fulfilled, relay 376 will be held over its top winding. In case, however, any irregularity should have occurred so that flash or flicker pulses are still being applied to the lamp lead, relay 367 will deenergize and will thereupon complete a circuit for relay 309 which looks up and gives the alarm as will be described subsequently. Relay 370 also at armature 372 prepares a circuit for relay 374, while at armature 373 relay 304 is connected over lead 734 to the test conductor 481 extending from the selector level for a purpose which will be described subsequently.
  • the earth for maintaining the connection should be supplied at this time from the junction relay set and is therefore OPEI'ZIthG to shunt relay 304. If relay 304 remains deenergized, at armature 305 and its back contact earth is applied to the 14th, 15th and 16th contacts in the bank of wiper 502 over armature 375 and accordingly the test switch is advanced through these positions as the various digits are received. IVhen the test switch is advanced to its 14th position after the reception of the first numerical digit, a circuit is completed from the earth on wiper 503 and over lead 460 for relay 357 and this upon operating, at armatures 358 and 359 connects relay 367 across the leads 482 and 483. That is to say the operation of relay 357, when the test switch is advanced to its 14th position, re-
  • relay 367 verses the connections of relay 367 to the junction from the selector level, extending over leads 482 and 483, so that in case either the negative or positive conductor is in contact with the corresponding conductor of some other junction, this reversal will prevent relay 367 from responding to impulses and the test switch will accordingly be prevented from advancing.
  • This operation only takes place for the reception of the second numerical digit and when this has been successfully completed, the test switch is stepped so that relay 357 is no longer energized.
  • the third and fourth numerical digits are then received in a similar manner and the test switch is accordingly stepped to its 17th position. In this position indicating lamp 548 is lighted and the earth on lead 427 is also extended over wiper 503 and lead 465 to relay 360.
  • relay 360 connects busy flash battery from lead 480 to the positive lead from the selector.
  • contacts 331 of relay 330 are short-cir cuited so as to prevent undue delay inthe operation of the alarm owing to the fact that this test is prolonged for three pulses of busy flash.
  • the application of busy. flash battery over the positive lead should result in the repeating back ofa corresponding connection from the junction relay set that is to say the connection of battery to the lead coming into the routiner over wiper 627 of the junction distributor JD Hence since relay 352 is still locked up and therefore armature 355 is operated, a circuitis now completed for the lower winding of relay 385.
  • relay 357 operates and breaks its own circuit at contacts 508 and thus advances the wipers of the test switch into the 21st position whereupon indicating lamp 550 lights.
  • relay 364 connects ringing current from the interrupted generator over the induction coil I to the positive lead 483 whence it is extended over the selectors used and through the condenser'in the talking circuit to the corresponding contact in the bank of wiper 628 of the junction distributor JD lead 405,
  • the polarized relay in the junction relay set revleases and disconnects the battery feed thereupon releasing relay 385.
  • the following circuit is now completed: earth, armature 392 and its front contact, armature 388 and its backcontact, lead 741, lead 445, 22nd con tact in the bank of wiper 504 and said wiper, interrupter springs 508, lead 441, lead 726 back contact and armature 313, lead 700,1ead 439, winding of magnet 507 to battery.
  • test switch is advanced to its 23rd position, in which position the earth on wiper 503 is extended over lead 457 to shortcircuit relay 352 and this after a slight interval releases and at armature 354 disconnects the battery feed through relay 389. Since the line relay of the junction relay set is in series with relay 389, it will also restore at this time and open the junction lamp circuit so that relay 376 should also now restore. Moreover the earth'on wiper 501 is now extended to the indicating lamp 541 to indicate the particular test in progress. When the test switch steps to its 24th position since the last two contacts in the bank of the homing wiper 506 are permanently connected to earth, it now returns to its normal position and relay 127 is again operated.
  • test switchis now operated in the manner previously described and earth through the interrupter 485 is connected over lead 453 to the first two contacts in the bank of wiper 502. Consequently testing for a free junction now recommences in the manner previously described and when such a junction is found the tests are carried out on it in the same way.
  • ⁇ Vhen all the junctions accessible over the junction distributor JD have been either tested or found busy, the junction distributor J D is brought into use and tests are made on the junctions accessible from its bank. lVhen these have all been dealt with, another idle position is seized and the junctions associated therewith are routined.
  • the bank of switches such as SD over which wiper 612 passes is multipled to the bank of a routine indicating switch RIS as shown in Figs. 5 and 7.
  • the routine indicating switch is stepped round, under the control of the routine indicating key RIK, the operating circuit for stepping magnet 516 being traced as follows: from battery, winding of stepping magnet 516, lead 95, contacts of routine indicating key, lead 96, armature 291 and its front contact, to earth, armature 291 being operated when the routine finish relay 285 is operated.
  • the associated indicating lamps will be lighted, and thus an indication will be given of the progress of the test.
  • the switch RIS it would be possible to make use of six relays each carrying ten pairs of springs and adapted to make connections similar to those effected by the switch RIS. This arrangement would have the advantage that on the ressing of the key corresponding to the key IK, all the lamps would be lighted at once.
  • the release alarm key RA is provided in order to enable the alarm to be disconnected after afault has been found. It will be seen that earth is provided over the normall closed contacts of this key and leads 690 and 72 to lock up the alarm relay 309 which is operated as shortly to be described when a fault is found.
  • the restart key RS enables the testing operation to be re-started after it has been stopped due to the distributors making a complete revolution without finding an pos tions idle and untested.
  • earth is then removed from lead 34 so as to open the locking circuit of the routine finished relay 285 while at the right-hand springs a point in the locking circurt of relay 152 is opened; consequentlv cond tlons are again restored for enabling the distributors to make a further test for positions which are idle and have not yet been dealt with.
  • the key PCR is operated before the start key SK and the former at its left-hand springs completes a circuit for relay 119 which operates and performs the functions previously described.
  • a circuit is completed from earth, armature 117 and its back contact. back contact and armature 156, right-hand springs of key PCR, winding of relay 137 to battery.
  • relay 137 at armature 139 connects earth to the stepping keys, at armature 1 10 opens a point in the homing circuit of the secondary distributors, at armature 141 prepares a circuit for relay 285 and at armature 142 completes a locking circuit for itself.
  • the group stepping key GS is now operated to move the primary distributor wipers into engagement with the required secondary distributor, the circuit extending from earth, front contact and armature 139, springs of key GS, lead 67:2. lead 68, lead 168, winding of magnet 607 to battery over lead 29 to the winding of relay 233. Then the position stepping key PS is operated and each time its contacts close a circuit is completed from earth at armature 139, contacts of key PS, lead 666, lead 27, wiper 605 to magnet 610 and thence to battery through relay 233 as before.
  • relay 166 is operated as before and opens the circuit of relay 175 at armature 169.
  • ⁇ Vhile relay 175 holds up. however, a circuit is completed from earth, armature 179 and its front contact, lead 674, front contact and armature 1'70, armature 141 and its front contact, lead 64, back contact and armature 2S8. upper winding of relay 285 to battery.
  • Relay 285 being of the two-step type operates its light armature 290 at this time, thereby shortcircuiting its lower winding over lead 31 and the lefthand contacts of the re-start key.
  • relay 1'75 releases after its slow period the circuit of the unction distributor magnet is opened and it accordingly steps the associated wipers thereby opening the circuit of relay 166 which also releases after a slight interval. Moreover at armature 170 the shunt earth is removed from the lower winding of relay 285 and it now operates fully thereby lighting the routine finished lamp and performing the other functions previously described. If it is desired to make a further teston the junctions in this position, the re-start key is operated whereupon at the left-hand contacts of this key the looking circuit of relay 285 is opened and the previous conditions are restored.
  • the key TOR is operated instead of the key PCR. Thereupon at the left-hand contacts of this key a circuit is completed for relay 119 as before, while at the right-hand contacts earth from the back contact of armature 117 is extended to the winding of relay 162.
  • Relay 162 upon operating, at armature 163 opens the pulsing circuit for the junction distributor so that this shall not be advanced at the end of each test, at armature 164 applies earth to the stepping keys and at armature 165 completes a lockin circuit for itself.
  • the key FL is provided and when this is operated acircuit is completed for relay 119 as before and also relay 143 is operated.
  • This at armature 144 supplies earth to the stepping keys in the usual manner and opens the circuit of the visible alarms
  • at armature 145 opens a point in the circuit of relay 131
  • at armature 146 prepares a circuit for relay 180
  • at armature 147 completes a locking circuit for itself
  • at armature 148 prepares a stepping circuit for the auxiliary secondary distributor since as relay 131 will not be operated in this case no circuit is completed by it
  • at armatures 149 and 150 prepares connections over the auxiliary secondary distributor to the order wires extending to the position in question and at armature 151 removes earth from the second group of multipled-contacts in the bank of wiper 606 of the test switch.
  • relay 180 Since relay 180 is not yet operated in this case, this means that tests will start at position 13 of the test switch owing to the homing earth remaining connected to the first group of multipled contacts. The attendant may now if he wishes by operating the appropriate stepping keys set the distributing switches on to any desired junction at any position and theifoperate the start key and observe from the supervisory lamps the progress of each test. When the test switch has rotated to position 13, relay .180 is operated over Wiper 505 and the test then proceeds in the normal manner.
  • relay 131 when the attendant is locating faults, since relay 131 does not have to be operated, he may make connection with a position which is staffed, and may if he wishes insert the jack J in the plug P and order up a connection from the operator overa particular junction. It will be seen that when the jack is inserted in the plug, .the transmitter and receiver of a handset 89 specially provided onthe routine are connected up to leads 76 and 77 and thence through the repeating coil windings to the upper and lower windings of the relay 395. This relay accordingly operates and at armature 39.6 connects up the other windings of the repeating coil in a circuit includingarmatures 149 and.
  • the capacity of the two junction distributors is 46 junctions and it is not desirable to provide more than two of these distributors.
  • the remaining four can conveniently be dealt with over contacts 1,:'4 of the firstjunction distributor, the changeover from junc tions 14to junctions 4750 being made by suitable relays.
  • the positions are assumed to be equipped with 50 junctions and accordingly the quick routine test is madeover junctions 47/50.
  • the quick routine key QR is thrown, whereupon atthe right-hand contacts of this key a circuit is prepared for relay 159.
  • relays 535 and 536 are associated with the particular position and may conveniently be mounted In case, however, there adjacent to the battery feed relay 533: relay 299, however is located in the routiner and serves for all the positions.
  • junction distributors are then moved to the position routined contacts, that is, the 24th position of the second junction distributor, and the operation of relay 166 brings down relays 152 and 159 and allows testing to take place for the next free position on which the quick routine test is made in similar manner.
  • this means to make a quick routine test which will test all the common equipment at the operators position and also junctions 17-50 and will only occupy a fraction of the time required for the full test. It will be appreciated that in the case of positions equipped with 50 junctions, in order to test all the junctions it will first be necessary to make the full routine test which will deal with junctions 146 and subsequently to make the quick routine test which will then deal with junctions 4750.
  • Relay 306 first operates its light armature 308 and subsequently also armature 307 thereby transferring the pulses to relay 309. If the conditions persist, relay 309 operates in due course locks up to the key RA at arma tnre 312, at armature 313 opens the circuit of magnet 507 to prevent the test switch moving, at armature 311 lights an alarm lamp, and at armature 310 connects up an alarm bcll, assuming relay 143 is not operated. It will be seen that the circuit prepared for the lower winding of relay 311 at armature 183 is opened by relay 330 each time that relay operates to step the test switch.
  • the normally energized relays 278 and 280 associated respectively with the junction distributors and the primary and secondary distributors serve to supervise the operation of the magnets of these switches.
  • battery feed is through relay 233 and this at armature 231 connects earth to lead 58 and hence through lamp 283 to relay 314.
  • battery feed relay 295 at armature 296 supplies earth through lamp 2t lVhen the start key is restored, earth is connected over armature 123 to lead 57 and should relays 278 and 280 not operate in due course, relay 314 would again be operated and the alarm be given so that supervision is obtained of the return of the switches to normal.
  • the routine finished lamp 528% also obtains its battery from relay 311 so that an alarm is given in case the attendant does not at once notice the lighting of the lamp.
  • armatures 196-- 204: of relay 195 and 200213 of relay 205 are wired to the auxiliary secondary distributors ASD and ASI) in the same way as the corresponding armatures of relay 185 are wired to the auxiliary secondary distributor ASD.
  • automatic routine testing equipment for testing telephone apparatus
  • a hunting switch for associating said testing equipment with said telephone apparatus over the bank contacts of said switch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
US222741A 1926-10-14 1927-09-29 Telephone system Expired - Lifetime US1745038A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25634/26A GB283643A (en) 1926-10-14 1926-10-14 Improvements in telephone systems

Publications (1)

Publication Number Publication Date
US1745038A true US1745038A (en) 1930-01-28

Family

ID=10230832

Family Applications (1)

Application Number Title Priority Date Filing Date
US222741A Expired - Lifetime US1745038A (en) 1926-10-14 1927-09-29 Telephone system

Country Status (3)

Country Link
US (1) US1745038A (fr)
FR (1) FR664216A (fr)
GB (1) GB283643A (fr)

Also Published As

Publication number Publication date
FR664216A (fr) 1929-08-30
GB283643A (en) 1928-01-16

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